Email Checker Website Semrush |best| -

.container max-width: 900px; margin: 0 auto; background: white; border-radius: 20px; box-shadow: 0 20px 60px rgba(0,0,0,0.3); overflow: hidden;

This creates a production-ready email checker similar to Semrush's tool with comprehensive validation and a professional UI.

button:hover transform: translateY(-2px);

.status font-size: 1.2rem; margin-top: 10px; font-weight: 600;

.check-status.failed background: #fee2e2; color: #991b1b;